高中英语人教大纲第三册：Unit4Greenworld(第二课时)

1、The Second PeriodTeaching Aims:1.Get the students to learn and master the new words and expressions:make attempt to do sth.,o,group,have an appetite for.,on a large scale,involve in,abandoned2.Get the students to learn the whole text and grasp the main idea of it to improve their reading ability.3.L

2、earn the fine quality of the scientists in the text.Teaching Important Points:1.Master the usages of the useful words and expressions above.2.Improve the students reading ability.Teaching Difficult Points:1.The usages of some words and expressions.2.How to train the students reading ability in learn

3、ing the text.Teaching Methods:1.Explanation to get the students to have a clear idea.2.Discussion to get the students grasp the main idea.3.Comparison to get the students to understand the text easier.Teaching Aids:1.a computer2.a courseware3.a tape recorderTeaching Procedures:Step Greetings and Lea

4、d-inTeacher greets the whole class as usual.T:In the last period,I told you to describe the process of planting and growth of the young plant.Now Ill let one student do this before class.Zhang Jian,do this,please.(Teacher asks three students to do the description.Then teacher and students learn the

5、new words and expressions of this period.Teacher asks one student to read them and then let another student correct the mistakes if there are any.In the end,teacher gives brief explanations if necessary.)Step Fast-reading (Show the pictures of Michurin and Darwin.)T:Do you know the two scientists?Ss

6、:Yes.They are Michurin and Darwin.T:Which country did they come from,do you know?Sa:Michurin was a Russian and Darwin was a famous British naturalist.T:What are they famous for?Sb:Michurin is famous for grafting plants and Darwin is famous for his book,On the Origin of Species.T:(Show the following

7、on the screen.)In this class,well learn about some other scientists.They are Carl Linnaeus,Daniel Solander and Joseph Banks.Read the text fast and try to grasp the main idea of the whole text.Then do the exercises on the screen.You should write the ans-wers on a piece of paper.Later,Ill collect the

8、first five pieces.Read the whole text and then choose the best answers.1.In the sixteenth century,botany was a branch of_.A.biologyB.physicsC.astronomyD.medicine2.Which of the following sentences is true?A.Linnaeus contribution to science was quite small.B:All of Linnaeus ideas were completely new.C

9、.Before Linnaeus there was no system to classify plants.D.Linnaeus system was simple and clear.3.Joseph Banks chose a career in science because_.A.he thought that was a good way of making moneyB.he was interested in botanyC.his father had died when he was only eighteen years oldD.he was very wealthy

10、4.The members of the Royal Society abroad the Endeavour included_.A.Joseph Banks and James CookB.Carl Linnaeus and Joseph BanksC.James Cook and Daniel SolanderD.Daniel Solander and Joseph Banks5.Joseph Banks interests lay in _.A.astronomy and botanyB.botany and medicineC.agriculture and botanyD.geog

11、raphy and economy (Students read the text and then do the exercises.Later,teacher collects the first five pieces of answers,check them and gives them back to the students.)T:Now lets check the answers.Sc,read your answers,please.Sc:The first answer is “D”;the second “B”;the third “B”;the fourth“D”,a

12、nd the fifth “C”.T:Is he right?Ss:Yes,his answers are all right.Step ReadingT:(Teacher shows the following on the screen.)Now read the text again and then discuss the questions on the screen.Have a discussion with your partner and later well check the answers.(Teacher goes into the students and join

13、s in the students discussion.)Answer the following questions:1.What were the goals of James Cooks first voyage around the world?2.Why did Joseph Banks have to supply his own money to equip part of the expedition?How much did he pay?3.How did scientists classify plants before Linnaeus?How did Linnaeu

14、s do this?4.What did the word “appetite” in the third paragraph mean?5.What could be a possible explanation for the name “strawberry”?6.Why was Carl Linnaeus important to the history of botany as a science?7.Give at least three examples to show Banks great contributions to his country and science.T:

15、(After a few minutes.)Are you ready?Ss:Yes.T:Now who will give us the first answer?SD:Ill answer the first question.They had three goals.The first goal was to observe the planet Venus when it passed across the sun.This would get the astronomers to have a chance to work out the distance between the e

16、arth and the sun.The second goal was to record,classify and describe all plants and animal life observed during the trip.The third goal was that Captain Cook was given secret instructions to search for an unknown southern continent.T:The second answer?One by one.SE:2.Because botany was a new field o

17、f science,the government would not pay for it.He paid about 10 000.SF:3.Some scientists classified plants into herbs and trees,or according to the shape of the plant,or whether they had flowers or not.Linnaeus grouped plants in families.In his system the identification of different species was based

18、 on the arrangement of the male and female organs in the flowers.SG:4.The word “appetite” here means “a desire or wish”.SH:5.I think the reason is like this:strawberry comes from a kind of grass,whose stem is like a straw,so it is called strawberry.T:Are there any other opinion?SI:I have a different

19、 view.I think the reason is just like what the text tells us.When people plant strawberry,they spread straw under the fruit to reduce the necessary amount of the watering as straw prevents the water in the soil escaping.SJ:6.Because his work was a breakthrough in botany.His idea of grouping plants i

20、n families was unique.Before him other scientists tried to give each species two names,but names were not truly fixed and accepted.SK:7.He made a voyage with James Cook to the Oceania,which brought great benefit to Britain.But for him,he had to supply about 10 000 of his own money to equip the exped

21、ition.SL:During his trip,he looked out for new economic species,helping to develop local economics.Sm:He was involved in enterprises such as the exploration of Africa and the settlement of Australia.Sn:He helped developing the royal gardens at Kew into one of the greatest botanical gardens in the wo

22、rld.T:Well done.Congratulate you on understanding the text so well.Step Language PointsT:(Show the following on the screen.)Now Ill explain some words and expressions in the text.Please pay attention to their usages.Usages of some words and expressions:1.make attempt to do sth.e.g.He made no attempt

23、 to take a medical degree.We failed in our attempt to climb the mountain.2.o.e.g.Children in school are classified into grades.Eggs are classified according to size.3.groupe.g.We can group animals into several types.4.have an appetite for.e.g.I have an appetite for classical music.5.on a large scale

24、e.g.Beijing is beautiful on a large scale to greet the coming Olympics.6.involve int involve me in your quarrel.They are deeply involved in debt.7.abandonede.g.The abandoned house was torn down.T:(After explaining the words and expressions.)Do you have any questions?Go over the text and see if you h

25、ave any.(Teacher and students have a discssion about the questions raised by the students.)Step Listening and Reading AloudT:Now lets listen to the tape.Ill play the tape twice.The first time I play the tape,just listen carefully.When I play it for the second time,you can listen and read together wi

26、th the tape in a low voice.Are that read the text aloud.Aer you clear?Ss:Yes.(After listening,teacher goes among the students and corrects the mistakes made by the students in pronunciation and intonation.)Step Summary and Homework (Teacher writes the events on the blackboard.)T:In this class,weve l

27、earned the text “The Birth of a Science”.Close your books and have a discussion with your partner about the events and tell us in which year each event took place.Botany was merely a branch of medicine.Linnaeus developed his system of classifying plants into families.Solander went to London and made

28、 friends with Banks.Bankss father died and he made a career in science.Banks made his first journey to study wild plants.Banks and Solander joined the team of botany explorers,led by James Cook.The Endeavour returned and they discovered strange new lands,cultrue,animals and plants.Banks was elected president of the Royal Society.He held